when on the home screen you should be able to click up until you’re in the top bar and then select the current user. when you click that one, you should get an option sign-out (among others such as switch user).

if you’re actually using a home user, the sign-out might not be available.
in that case you might try accessing https://app.plex.tv/desktop#!/settings/devices and remove the Roku… this should require the Roku client to be signed in during the next start of the client.

@tom80H said:
when on the home screen you should be able to click up until you’re in the top bar and then select the current user. when you click that one, you should get an option sign-out (among others such as switch user).

if you’re actually using a home user, the sign-out might not be available.
in that case you might try accessing https://app.plex.tv/desktop#!/settings/devices and remove the Roku… this should require the Roku client to be signed in during the next start of the client.